[asterisk-users] Asterisk 1.8.11.0 Debian Squeeze packages with T.38 gateway, queue hints and fixed RFC4235 (notifycid=yes)

Mon Apr 23 00:21:08 CDT 2012

On 18/04/2012 6:39 AM, Kevin P. Fleming wrote:
> On 04/17/2012 06:17 AM, Larry Moore wrote:
>> The send log you have posted does not show any outgoing T.38 packets
>> from your system.
>>
>> I set up a test build of 1.8.11.0 using the patch recently released, I
>> have difficulties sending T.38 with this patch, in fact I cannot send
>> successfully however I can receive. I did however observe some outgoing
>> T.38 packets. The analogue fax modem I was dialling into is under my
>> control hence the log files showed there was no signalling coming from
>> my ITSP,
>>
>> The T.38 session on my Asterisk server show the CRP's which were sent
>> from the analogue fax device during the negotiation.
>>
>> The patch I have used for a while seems to give me outgoing
>> functionality as well as incoming.
>>
>> I can't reproduce your scenario whereby your T.38 session is
>> communicating with a different gateway to the SIP server you use hence
>> can only speculate that Asterisk has difficulty wanting to send T.38 SDP
>> traffic when it is a different device than the SIP server it negotiates
>> with.
>
> We know for a fact that Asterisk has no trouble with the signaling and 
> media going to different addresses/ports. Honestly, I just don't 
> understand why all of this effort is being put into trying to use an 
> old (and clearly broken) patch for adding T.38 gateway support to 
> Asterisk 1.8.
>
> You guys know that it works in Asterisk 10, but you say you can't use 
> Asterisk 10 for some reason that I don't understand.
>

I have downloaded asterisk 10.3.0 and compiled on a Centos 6 system I 
setup to compare behaviour on OpenBSD with a Linux version of asterisk 
based upon the OpenBSD port.

Unfortunately the T.38 Gateway functionality in my build of 10.3.0 
doesn't appear to work. Looking at the upgrade documentation from 1.8 
there doesn't appear to be any considerations applicable to my setup.

As an excercise in futility I downloaded the Asterisk 1.8.11.0 source 
and compiled using the version of T.38 patch I have maintained and 
tested by sending a fax via an IAX channel out through my SIP provider, 
the fax was sent successfully.

I then removed and recreated the asterisk 1.8.11.0 directory and applied 
the back-port patch and observed the same problem when attempting to 
send through the T.38 gateway as was observed in Asterisk 10.

Console output of Asterisk 1.8.11.0 with Asterisk 10 backport patch:

  asterisk-dev*CLI>
     -- Accepting AUTHENTICATED call from 192.168.54.12:
 > requested format = slin,
 > requested prefs = (),
 > actual format = slin,
 > host prefs = (slin|alaw|ulaw),
 > priority = mine
     -- Executing [NNNNNNNN at FAX-T30:1] Set("IAX2/iaxmodem1-4445", 
"FAXOPT(t38gateway)=yes") in new stack
     -- Executing [NNNNNNNN at FAX-T30:2] Dial("IAX2/iaxmodem1-4445", 
"SIP/NNNNNNNN at itsp-fax,55") in new stack
   == Using SIP RTP TOS bits 184
   == Using SIP RTP CoS mark 5
     -- Called SIP/NNNNNNNN at itsp-fax
     -- SIP/itsp-fax-00000004 is making progress passing it to 
IAX2/iaxmodem1-4445
     -- SIP/itsp-fax-00000004 answered IAX2/iaxmodem1-4445
[Apr 23 21:14:11] NOTICE[14165]: channel.c:4152 __ast_read: Dropping 
incompatible voice frame on SIP/itsp-fax-00000004 of format slin since 
our native format has changed to 0x8 (alaw)
   == Using UDPTL TOS bits 184
   == Using UDPTL CoS mark 5
[Apr 23 21:14:12] ERROR[14165]: astobj2.c:110 INTERNAL_OBJ: user_data is 
NULL
[Apr 23 21:14:23] WARNING[14165]: res_rtp_asterisk.c:2135 ast_rtp_read: 
RTP Read too short
[Apr 23 21:14:24] WARNING[14165]: res_rtp_asterisk.c:2135 ast_rtp_read: 
RTP Read too short
[Apr 23 21:14:24] WARNING[14165]: res_rtp_asterisk.c:2135 ast_rtp_read: 
RTP Read too short
[Apr 23 21:14:24] WARNING[14165]: res_rtp_asterisk.c:2135 ast_rtp_read: 
RTP Read too short
[Apr 23 21:14:24] WARNING[14165]: res_rtp_asterisk.c:2135 ast_rtp_read: 
RTP Read too short
[Apr 23 21:14:24] WARNING[14165]: res_rtp_asterisk.c:2135 ast_rtp_read: 
RTP Read too short
[Apr 23 21:14:24] WARNING[14165]: res_rtp_asterisk.c:2135 ast_rtp_read: 
RTP Read too short
[Apr 23 21:14:24] WARNING[14165]: res_rtp_asterisk.c:2135 ast_rtp_read: 
RTP Read too short

Console output of Asterisk 10.3.0:

Connected to Asterisk 10.3.0 currently running on asterisk-dev (pid = 14798)
Verbosity is at least 3
Core debug is at least 3
     -- Accepting AUTHENTICATED call from 192.168.54.12:
 > requested format = slin,
 > requested prefs = (),
 > actual format = slin,
 > host prefs = (slin|alaw|ulaw),
 > priority = mine
     -- Executing [NNNNNNNN at FAX-T30:1] Set("IAX2/iaxmodem1-863", 
"FAXOPT(t38gateway)=yes") in new stack
     -- Executing [NNNNNNNN at FAX-T30:2] Dial("IAX2/iaxmodem1-863", 
"SIP/NNNNNNNN at itsp-fax,55") in new stack
   == Using SIP RTP TOS bits 184
   == Using SIP RTP CoS mark 5
     -- Called SIP/NNNNNNNN at itsp-fax
     -- SIP/itsp-fax-00000000 is making progress passing it to 
IAX2/iaxmodem1-863
     -- SIP/itsp-fax-00000000 answered IAX2/iaxmodem1-863
   == Using UDPTL TOS bits 184
   == Using UDPTL CoS mark 5
[Apr 23 21:25:15] ERROR[14983]: astobj2.c:110 INTERNAL_OBJ: user_data is 
NULL
[Apr 23 21:25:26] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
[Apr 23 21:25:26] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
[Apr 23 21:25:26] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
[Apr 23 21:25:26] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
[Apr 23 21:25:27] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
[Apr 23 21:25:27] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
[Apr 23 21:25:27] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
[Apr 23 21:25:27] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
.
.
.
[Apr 23 21:25:49] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
[Apr 23 21:25:49] WARNING[14983]: res_rtp_asterisk.c:2138 ast_rtp_read: 
RTP Read too short
     -- Executing [h at FAX-T30:1] NoOp("IAX2/iaxmodem1-863", "Call/Fax 
Ended 2012-04-23 21:25:57 +0800") in new stack
   == Spawn extension (FAX-T30, NNNNNNNN, 2) exited non-zero on 
'IAX2/iaxmodem1-863'
     -- Hungup 'IAX2/iaxmodem1-863'

A packet capture reveals T.38 invite coming from my ITSP but none 
originating from asterisk to my ITSP.

I don't intend pursuing this further however I am awaiting the asterisk 
10.x port on OpenBSD.

My five-cents worth!

Larry.